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Heavy water (D₂O) has an application in atomic reactor as:

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coolant

moderator

both coolant and moderator

neither coolant nor morderator

answer is B.

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Detailed Solution

Neutrons are important particles for the nuclear reactions to proceed but in a nuclear reactor, they are traveling at extremely high speed.

Heavy water is used as a moderator because it slows down the neutrons without absorbing many neutrons. Hydrogen is not used as a moderator because it absorbs neutrons.

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